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package examples.concurrency.javatutorial;

public class SimpleThreads {
    // Display a message, preceded by the name of the current thread
    static void threadMessage(String message) {
        String threadName = Thread.currentThread().getName();
        System.out.format("%s: %s%n", threadName, message);
    }

    private static class MessageLoop implements Runnable {
        public void run() {
            String importantInfo[] = { "Mares eat oats", "Does eat oats", "Little lambs eat ivy",
                    "A kid will eat ivy too" };
            try {
                for (int i = 0; i < importantInfo.length; i++) {
                    // Pause for 4 seconds
                    Thread.sleep(5000);
                    // Print a message
                    threadMessage(importantInfo[i]);
                }
            } catch (InterruptedException e) {
                threadMessage("I wasn't done!");
            }
        }
    }

    public static void main(String args[]) throws InterruptedException {

        // Delay, in milliseconds before we interrupt MessageLoop thread (default one hour).
        long patience = 1000 * 60 * 60;

        // If command line argument present, gives patience in seconds.
        if (args.length > 0) {
            try {
                patience = Long.parseLong(args[0]) * 1000;
            } catch (NumberFormatException e) {
                System.err.println("Argument must be an integer.");
                System.exit(1);
            }
        }

        threadMessage("Starting MessageLoop thread");
        long startTime = System.currentTimeMillis();
        Thread t = new Thread(new MessageLoop());
        t.start();

        threadMessage("Waiting for MessageLoop thread to finish");
        // Loop until MessageLoop thread exits.
        while (t.isAlive()) {
            threadMessage("Still waiting...");
            // Wait maximum of 1 second for MessageLoop thread to finish.
            t.join(1000);
            if (((System.currentTimeMillis() - startTime) > patience) && t.isAlive()) {
                threadMessage("Tired of waiting!");
                t.interrupt();
                // Shouldn't be long now -- wait indefinitely.
                t.join();
            }
        }
        threadMessage("Finally!");
    }
}
